Hey, could you provide some pictures? From what I hear you only need a new screen, maybe a new home button aswell, without touch-Id unfortunally. Only way to get a back-up is if its already on your iClound, if not you must have a working screen.

Hey, is your gps acting out aswell? Like 90% of my customers with your issue is the F-Antennas fault. Replace that part and your phone is working again. Wifi/bluetooth and GPS is "controlled" by the F-antenna iPhone 6 Logic Board Antenna Flex Cable

Error 56 Most likely a dead/glitched Touch ID sensor. If seen on iPad's, try restoring the latest firmware in DFU mode. If error still occurs, bring your device to Apple. On iPhones, take out the SIM card and try restoring in DFU mode. If still occurring, bring your device to apple. Alot of people have also fixed error 56 after NFC reflow or reball. U5301_RF reflow

Its super easy to do.. I have a guide complete but it has no pictures :(

You can follow this guide.. its kind of the same procedure, all you have to do is take out the old and put the new one in. if it does not stick properly, like it being loose, you can then apply a little bit of super glue or any adhesive.. the phone will not be waterproof/ water resistant tho.